diff --git a/docs/_docs/reference/other-new-features/open-classes.md b/docs/_docs/reference/other-new-features/open-classes.md
index 764c234df599..10af6ead669e 100644
--- a/docs/_docs/reference/other-new-features/open-classes.md
+++ b/docs/_docs/reference/other-new-features/open-classes.md
@@ -77,4 +77,4 @@ A class that is neither `abstract` nor `open` is similar to a `sealed` class: it
 
 ## Migration
 
-`open` is a new modifier in Scala 3. To allow cross compilation between Scala 2.13 and Scala 3.0 without warnings, the feature warning for ad-hoc extensions is produced only under `-source future`. It will be produced by default from Scala 3.1 on.
+`open` is a new modifier in Scala 3. To allow cross compilation between Scala 2.13 and Scala 3.0 without warnings, the feature warning for ad-hoc extensions is produced only under `-source future`. It will be produced by default [from Scala 3.4 on](https://github.com/lampepfl/dotty/issues/16334).